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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events On January 30, 2018, the company entered into an amendment to its Second A&R CDA Notes, which extended the maturity date to December 2022, among other things, as referenced in the “Debt and Financing” footnote to the consolidated financial statements.